Obama, Gates differ on nuclear weapons

President Barack Obama has set a goal of a "world without nuclear weapons" but the Pentagon is leaning in a seemingly contradictory direction: a modernized nuclear arsenal.  In the final months of the Bush administration, Defense Secretary Robert Gates argued that deeper cuts must be underpinned by production of a new warhead to replace an aging nuclear stockpile.  Gates' speech at the Carnegie Endowment for International Peace, says Hans Kristensen, an analyst at the Federation of American Scientists, was "an attempt to set a bottom line." Joe Cirincione explained that "There are lots of things that can be done to make real improvements to the existing stockpile, that should satisfy the concerns of those people who are genuinely concerned about safety and reliability."